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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4491b533334174bd4428025f2b47fc2ed612a1a563772fb91dff1b6cf01cd8d7' 
  AND token = 'CI3HgXOxY1xpPliq5Grbmgbv9eDCHpS1YVw+rJ4XxE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}